$\begin{array}{1 1}(a)\;\text{Both chromium metal ions are paramagnetic with 3 unpaired electrons}\\(b)\; \Delta_{oct}\; for\; [Cr(NH_3)_6]^{3+}\;\text{is calculated directly from the energy of yellow light}\\(c)\;  \Delta_{oct}\; for\; [Cr(OH_2)_6]^{3+}\;\text{is less than}\; \Delta_{oct}\; for \;[Cr(NH_3)_6]^{3+}\\(d)\;\text{A solution of }[Cr(OH_2)_6]Cl_3\text{ transmits light with an approximate wavelength range of 4000 - 4200 angstroms}\end{array}$
